If scrubbing the pesky oil stains on your kitchen countertops is not your cup of tea, Indiana researchers have come up with a new saving grace. Self-cleaning material.
They have developed a new coating for glass, plastics, and a range of other materials that would enable consumers to wipe away the ingrained oil smears with plain water.
AdvertisementThe same coatings can be added to common window cleaning sprays, and used to prevent bathroom mirrors, automobile windshields and other surfaces from fogging up.
"You add water, and the oil just comes right off like magic," said Dr. Jeffrey Youngblood, lead researcher on the project.
"These are eco-friendly coatings - environmentally 'green' in the sense that they eliminate the need for harsh detergents and solvents in settings ranging from home kitchens to industrial machine shops that must contend with heavy oil spills," he added.
Youngblood said that the material could be used in a range of consumer and industrial products.
They include household cleaners, easy-to-clean paints, water filters that separate water from oil, sealants for concrete floors and walls that repel oil in home garages and auto repair shops.
In addition, anti-fog coatings could be used on windshields or eyewear, including everyday lenses and fog-free scuba masks.
The eco-friendly plastics could reduce the need for detergents containing phosphates.
"We put out tons of detergents and phosphates each year," said Youngblood, adding that the polymer materials also could reduce the use of detergents for laundering clothes.
This would cut down on the release of phosphates, which wash into lakes and streams and stimulate growth of algae, depleting oxygen supplies in ways that cause fish kills in waterways and make swimming unsafe for humans.
"The idea is to use these polymers to clean in situations where it's inconvenient to apply soap or anywhere you would need to have oil cleaned off easily," said Youngblood, a materials engineer at Purdue University in West Lafayette, Ind.
These polymer coatings - about 20,000 times thinner than the width of a human hair - were highly sensitive to water and would break to the touch.
They have a bottom layer of polyethylene glycol, which attracts water, and an upper layer of a Teflon-like molecule that prevents the passage of oil.
The result is a surface that holds a film of water while repelling oil.
"Our work is a big step forward toward useable materials as either additives or coatings," he said, "and few others are working in this area. Most research on self-cleaning is done with different surfaces," say the researchers.
The findings were presented at the 238th National Meeting of the American Chemical Society (ACS).
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